/* ----------------------------------------------------------------------------
 *         ATMEL Microcontroller Software Support 
 * ----------------------------------------------------------------------------
 * Copyright (c) 2010, Atmel Corporation
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * - Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the disclaimer below.
 *
 * Atmel's name may not be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
 * DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
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 */

/** \file
 *
 *  Definitions and classes for USB Audio class requests.
 *
 *  - For a USB %device:
 *     -# After receiving an Audio request from the host, use
 *        AUDGenericRequest_GetEntity to determine the target Unit or Terminal.
 *     -# After receiving an Audio request from the host, use
 *        AUDGenericRequest_GetInterface to know which interface is referenced.
 *     -# Use AUDFeatureUnitRequest_GetControl to determine which control
 *        shall be tweaked following a host request.
 *     -# Use AUDFeatureUnitRequest_GetChannel to identify the channel which
 *        will have its control altered.
 */

#ifndef _AUDREQUESTS_H_
#define _AUDREQUESTS_H_
/** \addtogroup usb_audio
 *@{
 */
 
/*----------------------------------------------------------------------------
 *         Includes
 *----------------------------------------------------------------------------*/
 
#include <USBRequests.h>
 
/*----------------------------------------------------------------------------
 *         Definitions
 *----------------------------------------------------------------------------*/

/** \addtogroup usb_audio_request USB Audio request codes
 *      @{
 * This section lists the codes of the existing Audio requests.
 * - \ref AUDGenericRequest_SETCUR
 * - \ref AUDGenericRequest_GETCUR
 */
/** SET_CUR request code.*/
#define AUDGenericRequest_SETCUR                0x01
/** GET_CUR request code.*/
#define AUDGenericRequest_GETCUR                0x81
/** GET_MIN request code.*/
#define AUDGenericRequest_GETMIN                0x82
/** GET_MAX request code.*/
#define AUDGenericRequest_GETMAX                0x83
/** GET_RES request code.*/
#define AUDGenericRequest_GETRES                0x84
/**     @}*/

/** \addtogroup usb_audio_ctrl_sel USB Audio Control selector values
 *      @{
 * This section lists the available control selectors for a Feature Unit request.
 * - \ref AUDFeatureUnitRequest_MUTE
 */
/** Mute control selector (MUTE_CONTROL). */
#define AUDFeatureUnitRequest_MUTE              0x01
/** Volume control selector (VOLUME_CONTROL). */
#define AUDFeatureUnitRequest_VOLUME            0x02
/**     @}*/

/*----------------------------------------------------------------------------
 *         Types
 *----------------------------------------------------------------------------*/

#ifdef __ICCARM__          /* IAR */
#pragma pack(1)            /* IAR */
#define __attribute__(...) /* IAR */
#endif                     /* IAR */



#ifdef __ICCARM__          /* IAR */
#pragma pack()             /* IAR */
#endif                     /* IAR */

/*----------------------------------------------------------------------------
 *         Functions
 *----------------------------------------------------------------------------*/

extern uint8_t AUDGenericRequest_GetEntity(
    const USBGenericRequest *request);

extern uint8_t AUDGenericRequest_GetInterface(
    const USBGenericRequest *request);


extern uint8_t AUDFeatureUnitRequest_GetControl(
    const USBGenericRequest *request);

extern uint8_t AUDFeatureUnitRequest_GetChannel(
    const USBGenericRequest *request);

/**@}*/
#endif /* _AUDREQUESTS_H_ */
